linux-kernel - [PATCH v2 6/7] x86/mm: remove p4d

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Message-ID: <20250331081327.256412-7-bhe@redhat.com>
Date: Mon, 31 Mar 2025 16:13:26 +0800
From: Baoquan He <bhe@...hat.com>
To: akpm@...ux-foundation.org
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	yanjun.zhu@...ux.dev,
	Baoquan He <bhe@...hat.com>,
	x86@...nel.org
Subject: [PATCH v2 6/7] x86/mm: remove p4d_leaf definition

There's no p4d huge page support yet, let's use the generic definition.

And also update the BUILD_BUG_ON() in pti_user_pagetable_walk_pmd()
because p4d_leaf() returns boolean value.

Signed-off-by: Baoquan He <bhe@...hat.com>
Cc: x86@...nel.org
---
 arch/x86/include/asm/pgtable.h | 7 -------
 arch/x86/mm/pti.c              | 2 +-
 2 files changed, 1 insertion(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 5f4fcc0eea17..5ddba366d3b4 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -292,13 +292,6 @@ static inline unsigned long pgd_pfn(pgd_t pgd)
 	return (pgd_val(pgd) & PTE_PFN_MASK) >> PAGE_SHIFT;
 }
 
-#define p4d_leaf p4d_leaf
-static inline bool p4d_leaf(p4d_t p4d)
-{
-	/* No 512 GiB pages yet */
-	return 0;
-}
-
 #define pte_page(pte)	pfn_to_page(pte_pfn(pte))
 
 #define pmd_leaf pmd_leaf
diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
index c2e1de40136f..190299834011 100644
--- a/arch/x86/mm/pti.c
+++ b/arch/x86/mm/pti.c
@@ -206,7 +206,7 @@ static pmd_t *pti_user_pagetable_walk_pmd(unsigned long address)
 	if (!p4d)
 		return NULL;
 
-	BUILD_BUG_ON(p4d_leaf(*p4d) != 0);
+	BUILD_BUG_ON(p4d_leaf(*p4d));
 	if (p4d_none(*p4d)) {
 		unsigned long new_pud_page = __get_free_page(gfp);
 		if (WARN_ON_ONCE(!new_pud_page))
-- 
2.41.0